Jawfish includes bony and cartilaginous fish. Jaws are developed from third and fourth gill arches. The development of the jaw means the appearance of teeth. With the passage of time, jaws became important for feeding. Some 420 million years old, Entelognathus primordialis may be the first vertebrae with a modern jaw. Originally the jaws help to pump the water above the gills so that the fish can breathe more perfectly. Jaws help fishes to catch larger prey.

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Answer 1

Question

Chapter 27, Problem 1TY

Summary Introduction

Introduction:

Jawfish includes bony and cartilaginous fish. Jaws are developed from third and fourth gill arches. The development of the jaw means the appearance of teeth. With the passage of time, jaws became important for feeding. Some 420 million years old, Entelognathus primordialis may be the first vertebrae with a modern jaw. Originally the jaws help to pump the water above the gills so that the fish can breathe more perfectly. Jaws help fishes to catch larger prey.

Expert Solution & Answer

Answer to Problem 1TY

The correct answer is option (a) gnathostomes.

Explanation of Solution

Explanation/justification for the correct answer:

Option (a) gnathostomes. They are marine fishes. Jawed fishes belong to clade Gnathostomes. Gnathostomes possess 2 sets of paired fins (i.e. pelvic fin and pectoral fin). They are enclosed with bony plates. The gill filaments are ectodermal. An enormous placoderm was Dunkleosteous from the ‘Devonian period’, 380-360 million years ago. Gnathostomes belong to the clade Chondrichthyes and Osteichthyes.

Explanation for incorrect answer:

Option (b) lobe fins. Lobe-finned fishes or Sarcopterygii is a clade that contains coelacanths, tetrapods, lungfishes, etc. Sarcopterygii are sometimes also called Crossopterygii. Lobe fins are the most important characteristics of lobe-finned fishes. Their fins are very elastic. Therefore, this is an incorrect answer.

Option (b) tetrapods. The word "Tetrapoda" means "four feet" in Greek. Reptiles, birds, amphibians, and mammals are the chief groups of the Tetrapoda. They first appeared 370 million years back during the ‘Devonian period’. Tetrapods vary in size. One of the important characteristics of tetrapods is, they bear four legs or if they do not have four limbs, their ancestors are assumed to have four limbs. Therefore, this answer is not correct.

Option (d) amniotes.The characteristic feature of amniotes is an amniotic egg. Birds, reptiles, and prototherian mammal produce an amniotic egg. The outer shell of an egg is made of hard calcium to protect it from pathogens, predators, drying, and damage. Amniotic egg contains amnion. Amnion membrane is the special feature of amniotic animals.Therefore, this answer is not correct.

Option (e) cyclostomes.Cyclostomes are jawless fishes having a large sucking mouth. They are fresh-water and marine vertebrates. Due to the absence of jaw, they are termed as jawless vertebratesTherefore, this answer is not correct.

Conclusion

Gnathostomes are the jawed vertebrates. Gnathostomes include two clades i.e. Chondrichthyes and Osteichthyes. Hence, the correct answer is option (a).

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Students have asked these similar questions

A sample of blood was taken from the above individual and prepared for haemoglobin analysis. However, when water was added the cells did not lyse and looked normal in size and shape. The technician suspected that they had may have made an error in the protocol – what is the most likely explanation? The cell membranes are more resistant than normal. An isotonic solution had been added instead of water. A solution of 0.1 M NaCl had been added instead of water. Not enough water had been added to the red blood cell pellet. The man had sickle-cell anaemia.

With reference to their absorption spectra of the oxy haemoglobin intact line) and deoxyhemoglobin (broken line) shown in Figure 2 below, how would you best explain the reason why there are differences in the major peaks of the spectra? Figure 2. SPECTRA OF OXYGENATED AND DEOXYGENATED HAEMOGLOBIN OBTAINED WITH THE RECORDING SPECTROPHOTOMETER 1.4 Abs < 0.8 06 0.4 400 420 440 460 480 500 520 540 560 580 600 nm 1. The difference in the spectra is due to a pH change in the deoxy-haemoglobin due to uptake of CO2- 2. There is more oxygen-carrying plasma in the oxy-haemoglobin sample. 3. The change in Mr due to oxygen binding causes the oxy haemoglobin to have a higher absorbance peak. 4. Oxy-haemoglobin is contaminated by carbaminohemoglobin, and therefore has a higher absorbance peak 5. Oxy-haemoglobin absorbs more light of blue wavelengths and less of red wavelengths than deoxy-haemoglobin

Answer 2

Question

Chapter 27, Problem 1TY

Summary Introduction

Introduction:

Jawfish includes bony and cartilaginous fish. Jaws are developed from third and fourth gill arches. The development of the jaw means the appearance of teeth. With the passage of time, jaws became important for feeding. Some 420 million years old, Entelognathus primordialis may be the first vertebrae with a modern jaw. Originally the jaws help to pump the water above the gills so that the fish can breathe more perfectly. Jaws help fishes to catch larger prey.

Expert Solution & Answer

Answer to Problem 1TY

The correct answer is option (a) gnathostomes.

Explanation of Solution

Explanation/justification for the correct answer:

Option (a) gnathostomes. They are marine fishes. Jawed fishes belong to clade Gnathostomes. Gnathostomes possess 2 sets of paired fins (i.e. pelvic fin and pectoral fin). They are enclosed with bony plates. The gill filaments are ectodermal. An enormous placoderm was Dunkleosteous from the ‘Devonian period’, 380-360 million years ago. Gnathostomes belong to the clade Chondrichthyes and Osteichthyes.

Explanation for incorrect answer:

Option (b) lobe fins. Lobe-finned fishes or Sarcopterygii is a clade that contains coelacanths, tetrapods, lungfishes, etc. Sarcopterygii are sometimes also called Crossopterygii. Lobe fins are the most important characteristics of lobe-finned fishes. Their fins are very elastic. Therefore, this is an incorrect answer.

Option (b) tetrapods. The word "Tetrapoda" means "four feet" in Greek. Reptiles, birds, amphibians, and mammals are the chief groups of the Tetrapoda. They first appeared 370 million years back during the ‘Devonian period’. Tetrapods vary in size. One of the important characteristics of tetrapods is, they bear four legs or if they do not have four limbs, their ancestors are assumed to have four limbs. Therefore, this answer is not correct.

Option (d) amniotes.The characteristic feature of amniotes is an amniotic egg. Birds, reptiles, and prototherian mammal produce an amniotic egg. The outer shell of an egg is made of hard calcium to protect it from pathogens, predators, drying, and damage. Amniotic egg contains amnion. Amnion membrane is the special feature of amniotic animals.Therefore, this answer is not correct.

Option (e) cyclostomes.Cyclostomes are jawless fishes having a large sucking mouth. They are fresh-water and marine vertebrates. Due to the absence of jaw, they are termed as jawless vertebratesTherefore, this answer is not correct.

Conclusion

Gnathostomes are the jawed vertebrates. Gnathostomes include two clades i.e. Chondrichthyes and Osteichthyes. Hence, the correct answer is option (a).

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Answer 3

Question

Chapter 27, Problem 1TY

Summary Introduction

Introduction:

Jawfish includes bony and cartilaginous fish. Jaws are developed from third and fourth gill arches. The development of the jaw means the appearance of teeth. With the passage of time, jaws became important for feeding. Some 420 million years old, Entelognathus primordialis may be the first vertebrae with a modern jaw. Originally the jaws help to pump the water above the gills so that the fish can breathe more perfectly. Jaws help fishes to catch larger prey.

Expert Solution & Answer

Answer to Problem 1TY

The correct answer is option (a) gnathostomes.

Explanation of Solution

Explanation/justification for the correct answer:

Option (a) gnathostomes. They are marine fishes. Jawed fishes belong to clade Gnathostomes. Gnathostomes possess 2 sets of paired fins (i.e. pelvic fin and pectoral fin). They are enclosed with bony plates. The gill filaments are ectodermal. An enormous placoderm was Dunkleosteous from the ‘Devonian period’, 380-360 million years ago. Gnathostomes belong to the clade Chondrichthyes and Osteichthyes.

Explanation for incorrect answer:

Option (b) lobe fins. Lobe-finned fishes or Sarcopterygii is a clade that contains coelacanths, tetrapods, lungfishes, etc. Sarcopterygii are sometimes also called Crossopterygii. Lobe fins are the most important characteristics of lobe-finned fishes. Their fins are very elastic. Therefore, this is an incorrect answer.

Option (b) tetrapods. The word "Tetrapoda" means "four feet" in Greek. Reptiles, birds, amphibians, and mammals are the chief groups of the Tetrapoda. They first appeared 370 million years back during the ‘Devonian period’. Tetrapods vary in size. One of the important characteristics of tetrapods is, they bear four legs or if they do not have four limbs, their ancestors are assumed to have four limbs. Therefore, this answer is not correct.

Option (d) amniotes.The characteristic feature of amniotes is an amniotic egg. Birds, reptiles, and prototherian mammal produce an amniotic egg. The outer shell of an egg is made of hard calcium to protect it from pathogens, predators, drying, and damage. Amniotic egg contains amnion. Amnion membrane is the special feature of amniotic animals.Therefore, this answer is not correct.

Option (e) cyclostomes.Cyclostomes are jawless fishes having a large sucking mouth. They are fresh-water and marine vertebrates. Due to the absence of jaw, they are termed as jawless vertebratesTherefore, this answer is not correct.

Conclusion

Gnathostomes are the jawed vertebrates. Gnathostomes include two clades i.e. Chondrichthyes and Osteichthyes. Hence, the correct answer is option (a).

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Answer 4

Question

Chapter 27, Problem 1TY

Summary Introduction

Introduction:

Jawfish includes bony and cartilaginous fish. Jaws are developed from third and fourth gill arches. The development of the jaw means the appearance of teeth. With the passage of time, jaws became important for feeding. Some 420 million years old, Entelognathus primordialis may be the first vertebrae with a modern jaw. Originally the jaws help to pump the water above the gills so that the fish can breathe more perfectly. Jaws help fishes to catch larger prey.

Expert Solution & Answer

Answer to Problem 1TY

The correct answer is option (a) gnathostomes.

Explanation of Solution

Explanation/justification for the correct answer:

Option (a) gnathostomes. They are marine fishes. Jawed fishes belong to clade Gnathostomes. Gnathostomes possess 2 sets of paired fins (i.e. pelvic fin and pectoral fin). They are enclosed with bony plates. The gill filaments are ectodermal. An enormous placoderm was Dunkleosteous from the ‘Devonian period’, 380-360 million years ago. Gnathostomes belong to the clade Chondrichthyes and Osteichthyes.

Explanation for incorrect answer:

Option (b) lobe fins. Lobe-finned fishes or Sarcopterygii is a clade that contains coelacanths, tetrapods, lungfishes, etc. Sarcopterygii are sometimes also called Crossopterygii. Lobe fins are the most important characteristics of lobe-finned fishes. Their fins are very elastic. Therefore, this is an incorrect answer.

Option (b) tetrapods. The word "Tetrapoda" means "four feet" in Greek. Reptiles, birds, amphibians, and mammals are the chief groups of the Tetrapoda. They first appeared 370 million years back during the ‘Devonian period’. Tetrapods vary in size. One of the important characteristics of tetrapods is, they bear four legs or if they do not have four limbs, their ancestors are assumed to have four limbs. Therefore, this answer is not correct.

Option (d) amniotes.The characteristic feature of amniotes is an amniotic egg. Birds, reptiles, and prototherian mammal produce an amniotic egg. The outer shell of an egg is made of hard calcium to protect it from pathogens, predators, drying, and damage. Amniotic egg contains amnion. Amnion membrane is the special feature of amniotic animals.Therefore, this answer is not correct.

Option (e) cyclostomes.Cyclostomes are jawless fishes having a large sucking mouth. They are fresh-water and marine vertebrates. Due to the absence of jaw, they are termed as jawless vertebratesTherefore, this answer is not correct.

Conclusion

Gnathostomes are the jawed vertebrates. Gnathostomes include two clades i.e. Chondrichthyes and Osteichthyes. Hence, the correct answer is option (a).

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Chapter 27, Problem 1TY

Summary Introduction

Introduction:

Jawfish includes bony and cartilaginous fish. Jaws are developed from third and fourth gill arches. The development of the jaw means the appearance of teeth. With the passage of time, jaws became important for feeding. Some 420 million years old, Entelognathus primordialis may be the first vertebrae with a modern jaw. Originally the jaws help to pump the water above the gills so that the fish can breathe more perfectly. Jaws help fishes to catch larger prey.

Expert Solution & Answer

Answer to Problem 1TY

The correct answer is option (a) gnathostomes.

Explanation of Solution

Explanation/justification for the correct answer:

Option (a) gnathostomes. They are marine fishes. Jawed fishes belong to clade Gnathostomes. Gnathostomes possess 2 sets of paired fins (i.e. pelvic fin and pectoral fin). They are enclosed with bony plates. The gill filaments are ectodermal. An enormous placoderm was Dunkleosteous from the ‘Devonian period’, 380-360 million years ago. Gnathostomes belong to the clade Chondrichthyes and Osteichthyes.

Explanation for incorrect answer:

Option (b) lobe fins. Lobe-finned fishes or Sarcopterygii is a clade that contains coelacanths, tetrapods, lungfishes, etc. Sarcopterygii are sometimes also called Crossopterygii. Lobe fins are the most important characteristics of lobe-finned fishes. Their fins are very elastic. Therefore, this is an incorrect answer.

Option (b) tetrapods. The word "Tetrapoda" means "four feet" in Greek. Reptiles, birds, amphibians, and mammals are the chief groups of the Tetrapoda. They first appeared 370 million years back during the ‘Devonian period’. Tetrapods vary in size. One of the important characteristics of tetrapods is, they bear four legs or if they do not have four limbs, their ancestors are assumed to have four limbs. Therefore, this answer is not correct.

Option (d) amniotes.The characteristic feature of amniotes is an amniotic egg. Birds, reptiles, and prototherian mammal produce an amniotic egg. The outer shell of an egg is made of hard calcium to protect it from pathogens, predators, drying, and damage. Amniotic egg contains amnion. Amnion membrane is the special feature of amniotic animals.Therefore, this answer is not correct.

Option (e) cyclostomes.Cyclostomes are jawless fishes having a large sucking mouth. They are fresh-water and marine vertebrates. Due to the absence of jaw, they are termed as jawless vertebratesTherefore, this answer is not correct.

Conclusion

Gnathostomes are the jawed vertebrates. Gnathostomes include two clades i.e. Chondrichthyes and Osteichthyes. Hence, the correct answer is option (a).

Answer 6

Chapter 27, Problem 1TY

Summary Introduction

Introduction:

Jawfish includes bony and cartilaginous fish. Jaws are developed from third and fourth gill arches. The development of the jaw means the appearance of teeth. With the passage of time, jaws became important for feeding. Some 420 million years old, Entelognathus primordialis may be the first vertebrae with a modern jaw. Originally the jaws help to pump the water above the gills so that the fish can breathe more perfectly. Jaws help fishes to catch larger prey.

Expert Solution & Answer

Answer to Problem 1TY

The correct answer is option (a) gnathostomes.

Explanation of Solution

Explanation/justification for the correct answer:

Option (a) gnathostomes. They are marine fishes. Jawed fishes belong to clade Gnathostomes. Gnathostomes possess 2 sets of paired fins (i.e. pelvic fin and pectoral fin). They are enclosed with bony plates. The gill filaments are ectodermal. An enormous placoderm was Dunkleosteous from the ‘Devonian period’, 380-360 million years ago. Gnathostomes belong to the clade Chondrichthyes and Osteichthyes.

Explanation for incorrect answer:

Option (b) lobe fins. Lobe-finned fishes or Sarcopterygii is a clade that contains coelacanths, tetrapods, lungfishes, etc. Sarcopterygii are sometimes also called Crossopterygii. Lobe fins are the most important characteristics of lobe-finned fishes. Their fins are very elastic. Therefore, this is an incorrect answer.

Option (b) tetrapods. The word "Tetrapoda" means "four feet" in Greek. Reptiles, birds, amphibians, and mammals are the chief groups of the Tetrapoda. They first appeared 370 million years back during the ‘Devonian period’. Tetrapods vary in size. One of the important characteristics of tetrapods is, they bear four legs or if they do not have four limbs, their ancestors are assumed to have four limbs. Therefore, this answer is not correct.

Option (d) amniotes.The characteristic feature of amniotes is an amniotic egg. Birds, reptiles, and prototherian mammal produce an amniotic egg. The outer shell of an egg is made of hard calcium to protect it from pathogens, predators, drying, and damage. Amniotic egg contains amnion. Amnion membrane is the special feature of amniotic animals.Therefore, this answer is not correct.

Option (e) cyclostomes.Cyclostomes are jawless fishes having a large sucking mouth. They are fresh-water and marine vertebrates. Due to the absence of jaw, they are termed as jawless vertebratesTherefore, this answer is not correct.

Conclusion

Gnathostomes are the jawed vertebrates. Gnathostomes include two clades i.e. Chondrichthyes and Osteichthyes. Hence, the correct answer is option (a).

Answer 7

Chapter 27, Problem 1TY

Summary Introduction

Introduction:

Jawfish includes bony and cartilaginous fish. Jaws are developed from third and fourth gill arches. The development of the jaw means the appearance of teeth. With the passage of time, jaws became important for feeding. Some 420 million years old, Entelognathus primordialis may be the first vertebrae with a modern jaw. Originally the jaws help to pump the water above the gills so that the fish can breathe more perfectly. Jaws help fishes to catch larger prey.

Answer 8

Expert Solution & Answer

Answer to Problem 1TY

The correct answer is option (a) gnathostomes.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Explanation of Solution

Explanation/justification for the correct answer:

Option (a) gnathostomes. They are marine fishes. Jawed fishes belong to clade Gnathostomes. Gnathostomes possess 2 sets of paired fins (i.e. pelvic fin and pectoral fin). They are enclosed with bony plates. The gill filaments are ectodermal. An enormous placoderm was Dunkleosteous from the ‘Devonian period’, 380-360 million years ago. Gnathostomes belong to the clade Chondrichthyes and Osteichthyes.

Explanation for incorrect answer:

Option (b) lobe fins. Lobe-finned fishes or Sarcopterygii is a clade that contains coelacanths, tetrapods, lungfishes, etc. Sarcopterygii are sometimes also called Crossopterygii. Lobe fins are the most important characteristics of lobe-finned fishes. Their fins are very elastic. Therefore, this is an incorrect answer.

Option (b) tetrapods. The word "Tetrapoda" means "four feet" in Greek. Reptiles, birds, amphibians, and mammals are the chief groups of the Tetrapoda. They first appeared 370 million years back during the ‘Devonian period’. Tetrapods vary in size. One of the important characteristics of tetrapods is, they bear four legs or if they do not have four limbs, their ancestors are assumed to have four limbs. Therefore, this answer is not correct.

Option (d) amniotes.The characteristic feature of amniotes is an amniotic egg. Birds, reptiles, and prototherian mammal produce an amniotic egg. The outer shell of an egg is made of hard calcium to protect it from pathogens, predators, drying, and damage. Amniotic egg contains amnion. Amnion membrane is the special feature of amniotic animals.Therefore, this answer is not correct.

Option (e) cyclostomes.Cyclostomes are jawless fishes having a large sucking mouth. They are fresh-water and marine vertebrates. Due to the absence of jaw, they are termed as jawless vertebratesTherefore, this answer is not correct.

Answer 12

Conclusion

Gnathostomes are the jawed vertebrates. Gnathostomes include two clades i.e. Chondrichthyes and Osteichthyes. Hence, the correct answer is option (a).

Answer 13

Ch. 27.1 - Prob. 1CC Ch. 27.1 - Which of the following is not a defining...Ch. 27.1 - Prob. 2TYK Ch. 27.2 - Prob. 1BC Ch. 27.2 - What features distinguish ray-finned fishes from...Ch. 27.2 - Prob. 2CC Ch. 27.2 - Prob. 1TYK Ch. 27.2 - Prob. 2TYK Ch. 27.2 - Prob. 3TYK Ch. 27.3 - Prob. 1CC

Concept explainers

Answer to Problem 1TY

Explanation of Solution

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Chapter 27 Solutions